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https://issues.apache.org/jira/browse/HADOOP-4394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638693#action_12638693
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Raghu Angadi commented on HADOOP-4394:
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HADOOP-3205 would help reduce a data copy on the client.. which could reduce
25-30% cpu on DFSClient. Using Adler32 for checksums a Bryan Duxbury suggested
could further reduce CPU on DFSClient.
> DFSClient cpu overhead is too high
> ----------------------------------
>
> Key: HADOOP-4394
> URL: https://issues.apache.org/jira/browse/HADOOP-4394
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Reporter: Runping Qi
>
> When we do dfs throughput test using hadoop dfs -cat, we have observed that
> the client side cpu usage is very high, 3 to five times that of a data node
> serving the file.
> Before 0.18, the data node cpu usage was equally high, and this problem is
> fixed since 0.18. However, the client side problem still exists.
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